Question 9 (i) A brooch is made with silver wire in the form of a circle with diameter 35 mm. The wire is also used in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig. 12.12. Find: (i) The total length of the silver wire required.
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Solution
Number of diameters = 5 Length of diameter = 35 mm ∴Radius=352mm (i) Total length of silver wire required = Circumference of the circle + Length of 5 diameter =2πr+(5×35)mm =(2×227×352)+175mm =110+175mm=285mm